Broken tooth, gargle with salty water before sleeping. Any suggestions?

My child has part broken tooth some still hang on the gum, what should I do , wait and let the rest fall , trying to get an appointment with dentist but may have to wait a few days, will he be ok, he hasn't, complained about server pain but a lot of discomfort. I've ask him to brush gargle with salty water before sleeping, will he be ok , I mean chances of him chocking in his sleep eft.